What does HRESULT 0xC00D1B7F (NS_E_INVALIDCALL_WHILE_ENCODER_STOPPED) mean?

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This operation is only allowed during encoding.%0

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NS_E_NOTARCHIVING	NS_E_NOSOURCEGROUPS

NS_E_INVALIDCALL_WHILE_ENCODER_STOPPED

The failing stage in the Encoder object model

NS_E_INVALIDCALL_WHILE_ENCODER_STOPPED (0xC00D1B7F) means use of a runtime-only method after the encoder has stopped in encoder state-machine sequencing.

WMEncoder exposes configuration, preparation, running, paused, stopped and archival states. Properties that alter graph topology are normally set before Start, while statistics and some control operations are meaningful only after a session reaches the matching state.

Evidence to preserve

The same method can be valid in one encoder state and rejected in another without any file, codec or network defect. For example, statistics or live-control code runs from a timer after Stop completed.

Field	What to preserve
Values to record	RunState, requested method, stop callback time and owning object instance
Producing object	current encoder RunState, active source group, PrepareToEncode calls, Start/Pause/Stop order, archive state, thread and callback that issued the operation, and the first state-transition HRESULT

Reproduce the condition with one controlled change

Record 0xC00D1B7F, the Encoder version and the exact API call or property access that returned it.
Export the current .wme or .prx configuration, then capture RunState, requested method, stop callback time and owning object instance.
Verify the encoder state-machine sequencing precondition without changing the source, profile and output sink at the same time.
Run one controlled comparison that changes only the identified precondition: start and prepare a new session before invoking the runtime operation.

Interpret neighboring results carefully

Result	Why it differs
`NS_E_SOURCEGROUP_NOTPREPARED`	activation or start of a source group that has not completed PrepareToEncode
`NS_E_CANNOT_PAUSE_LIVEBROADCAST`	Pause is requested for a session actively broadcasting live output
`NS_E_INVALIDCALL_WHILE_ARCHIVAL_RUNNING`	attempt to alter archive configuration while the archive sink is active

Resolution and verification

To fix this occurrence, start and prepare a new session before invoking the runtime operation. Recreate the affected source group, profile or output object, repeat the same operation, and confirm that the same operation no longer returns NS_E_INVALIDCALL_WHILE_ENCODER_STOPPED.

Do not hide the ordering problem behind unconditional retries; log the transition sequence and make the operation occur at the documented lifecycle point.

Technical references

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